EP0079457A1 - Pipe coupling and its utilization - Google Patents

Pipe coupling and its utilization Download PDF

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Publication number
EP0079457A1
EP0079457A1 EP82109218A EP82109218A EP0079457A1 EP 0079457 A1 EP0079457 A1 EP 0079457A1 EP 82109218 A EP82109218 A EP 82109218A EP 82109218 A EP82109218 A EP 82109218A EP 0079457 A1 EP0079457 A1 EP 0079457A1
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EP
European Patent Office
Prior art keywords
pipe coupling
sealing sleeve
housing
coupling according
shaped part
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
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EP82109218A
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German (de)
French (fr)
Inventor
Immanuel Straub
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Individual
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Individual
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Publication date
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Publication of EP0079457A1 publication Critical patent/EP0079457A1/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L55/00—Devices or appurtenances for use in, or in connection with, pipes or pipe systems
    • F16L55/16—Devices for covering leaks in pipes or hoses, e.g. hose-menders
    • F16L55/168—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe
    • F16L55/17—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose
    • F16L55/172—Devices for covering leaks in pipes or hoses, e.g. hose-menders from outside the pipe by means of rings, bands or sleeves pressed against the outside surface of the pipe or hose the ring, band or sleeve being tightened by a tangentially arranged threaded pin and a nut
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L17/00—Joints with packing adapted to sealing by fluid pressure
    • F16L17/02—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket
    • F16L17/04—Joints with packing adapted to sealing by fluid pressure with sealing rings arranged between outer surface of pipe and inner surface of sleeve or socket with longitudinally split or divided sleeve

Definitions

  • the invention relates to a pipe coupling of the type mentioned in the preamble of claim 1.
  • Such a pipe coupling is known for example from DE-OS 24 28 101.4.
  • This known pipe coupling has proven itself very well in practice.
  • the special concept of this known coupling is that when the tensioning screws are not yet tightened, the inside diameter is larger than the outside diameter of the pipe or the sealing sleeve having the pipe ends to be connected when the tensioning screws are tightened in the circumferential direction (and thus also radially inwards), whereby the material of the sleeve and in particular its sealing lips, following the only degree of freedom, deviates inwards and is also pressed onto rough pipe outer surfaces for the sealing support.
  • No part of the sealing sleeve has its material in tension, i.e. stretched so that even when the elastic properties of the elastomer weaken, for example due to aging and / or thermal cycling, a perfect seal is guaranteed.
  • the known coupling can only be mounted by axially pushing it onto the pipe or onto the pipe ends to be connected. This in turn presupposes that one of the pipe ends must be axially accessible, i.e. that this pipe end must move either axially or laterally with respect to the other pipe end to be coupled and then - after the coupling has been pushed on - must be able to be brought back to the starting position.
  • This is not easily possible, especially with many existing pipes, so that the known coupling, e.g. If a pipe connection fails, the pipes of an existing pipe are still intact - if at all - can only be used after laborious additional work.
  • the proposed coupling has the features specified in the characterizing part of claim 1.
  • the sealing sleeve has a separating cut in the axial direction. On the one hand, this allows attachment from the radial direction. On the other hand, the sealing ability of the sealing sleeve could be called into question by this separation cut, but with the proposed coupling - when tightening the tensioning screws - the cutting surfaces adjacent to the separation cut become the Sealing sleeve because of the compression of the same in the circumferential sense already described, pressed so strongly against one another that, surprisingly, the sealing ability remains just as perfect as if the sealing sleeve were closed in their extent.
  • FIGS. 1-5 which make no claim to exact scale.
  • the coupling 10 shown has a housing 11 which encloses a sealing sleeve 12 made of an elastomer.
  • the housing 11 consists of a clamp-shaped part 13, at the ends 13 ', 13 "of which flaps 14, 15 are bent outwards and welded to the outer circumferential surface of the part 13.
  • the flap 14 encloses a hinge pin 16 which is provided with several, for example is provided with two parallel-axis and transverse threaded bores 17.
  • the tab 15 likewise encloses a hinge pin 18 which is provided with smooth transverse bores 19, with as many transverse bores 19 being provided as threaded bores 17 and at equal intervals. clamping bolts 20 screwed into the threaded bores 17 extend through the transverse bores 19 and through recesses in the tab 14 (not shown).
  • the clamp-shaped part 13 has inwardly directed ring flanges 21, 22 on both end faces, so that the clamp-shaped part has an axial profile approximately in the shape of an elongated C which is open towards the inside.
  • the housing 11 further consists of a (mounted) on the inside of the ends 13 ', adjacent 13 ", with the clip-shaped part about profil same U eberbrückungs- part 23 which, as can be seen from Fig. 1, n at the home 'is, for example unktver- weld fixed by P exterior of the end. 13 the housing 11, that is, the clamp-shaped part 13 and the bridging part 23 are preferably made of stainless steel.
  • the clamp-shaped part 13 which is formed in one piece in this embodiment, in principle has three sections, namely the sections 24 which are relatively rigid (due to the ring flanges 21, 22) and which adjoin the ends 13 ', 13 " , 25, which are connected to one another in their area opposite ends 13 ', 13 "by a central section 26.
  • the end-face annular flanges are separated into segments 28, 29 by a plurality of radially extending slots 27, the segment 29 diametrically opposite the ends 13 ', 13 "being significantly longer in the circumferential direction than the segments 28 adjacent to the segment 29 in the circumferential direction.
  • section 26 is flexible about bending axes parallel to the axis of the coupling and to a certain extent performs the function of a hinge, so that the clamp-shaped part can easily be expanded so far that the clamp-shaped part 13 extends from the radial direction via a tube 30 or over the joint between the ends of two aligned pipes.
  • the sealing sleeve 12 has an axial separating cut 31 (FIG. 2) which, in the assembled state, is offset in the circumferential direction with respect to the bridging part 23.
  • the one cut surface 32 of the sleeve 12 adjoining the separating cut 31 projects beyond the free end of the bridging part 23 projecting from the end 13 '.
  • the other cutting surface 33 of the sealing collar 12 adjoining the separating cut 31 is correspondingly arranged set back in the circumferential direction with respect to the end 13 ′′ and fastened there on the inside of the housing 11, for example by gluing.
  • the two cut surfaces 32 and 33 come to lie as congruently as possible, as clearly shown in FIG. 5, on the inside of the sealing sleeve 12 between the sealing lips 34 and 35 a guide tab 36, preferably glued from the same material as the sealing sleeve 12 itself.
  • the axial cross-sectional profile of the sealing sleeve can be seen clearly from FIGS. 3 and 4 (coupling ready for operation).
  • the cuff 12 has a web 37, on the end faces of which the sealing lips 34, 35, which are directed towards one another, are formed.
  • an annular, inwardly pointing bead 38, 39 is formed on the web 37, on which the sealing lips 35, 34 are supported on the outside.
  • the beads 38, 39 are also provided with substantially axially extending passages 40, 41.
  • split spring washers can also be provided (not shown) in order to support the sealing lips 35, 34 against the web 37.
  • FIG. 6 which is particularly suitable for large pipe diameters, differs from the previously described embodiment only in that the rigid sections 24, 25 of the clamp-like part 13 of the housing 11 do not have a flexible, integrally formed central section, but rather a Double hinge 43 are interconnected. At the ends of the sections 24, 25 opposite the ends 13 ', 13 "there are flaps 44, 45 which are bent outwards and each enclose a hinge pin 46, 47.
  • the hinge pins 46, 47 are connected to one another by means of screw bolts 48 couples, similar to what has been described for the hinge pins 16, 18.
  • the gap between the ends of the sections 24, 25 adjoining the double hinge 43 is bridged by a bridging part 49, which is located on the inside of these two ends and which is comparable to the bridging part 23.
  • the hinge pins 46, 47 can also be arranged closer to one another than shown in FIG. 6.
  • the described couplings which are initially each in the state of FIG. 1 or 6, can also be pushed axially onto a pipe end, and in this respect the coupling described can be used universally, in particular, as a "repair clamp".

Abstract

A housing (11), the circumference of which can be reduced, consists of a collar-shaped part (13), the ends (13', 13'') of which are detachably connected to one another with clamping screws (20) and of a bridging insert (23), abutting from the inside on the said ends (13', 13''). The collar-shaped part (13) is provided with annular flanges (22) on the end faces, directed inwards. The housing (11) encloses a sealing sleeve (12), of an elastomer, which has a C-shaped axial cross-section and is open inwards, the ends of which sealing sleeve (12), designed as sealing lips, are supported on the sleeve web via an annular support. When the clamping screws (20) are not tightened, the unobstructed internal diameter of the sealing sleeve (12) is greater than the nominal diameter of the coupling, related to the tube (30). In order to facilitate the positioning of the coupling on a tube (30) or on a butt joint between the ends of two aligned tubes, also from the radial direction, the sealing sleeve (12) has a separating section (31) running in the axial direction, and the collar-shaped part (13) has two sections, each connected to one end (13', 13''), which sections are connected to one another, like a hinge, in the region opposite the ends (13', 13''), in order to facilitate widening of the housing (11) to more than its nominal diameter, with the clamping screws released. <IMAGE>

Description

Die Erfindung betrifft eine Rohrkupplung der im Oberbegriff des Patentanspruches 1 genannten Art.The invention relates to a pipe coupling of the type mentioned in the preamble of claim 1.

Eine solche Rohrkupplung ist beispielsweise aus der DE-OS 24 28 101.4 bekannt. Diese bekannte Rohrkupplung hat sich in der Praxis sehr gut bewährt. Das besondere Konzept dieser bekannten Kupplung besteht darin, dass die bei noch nicht angezogenen Spannschrauben einen grösseren lichten Innendurchmesser als der Aussendurchmesser des Rohres bzw. der zu verbindenden Rohrenden aufweisende Dichtungsmanschette beim Anziehen der Spannschrauben in Umfangsrichtung (und damit auch radial nach innen) gestaucht wird, wodurch das Material der Manschette und insbesondere deren Dichtlippen, dem einzigen Freiheitsgrad folgend, nach innen ausweicht und zur dichtenden Auflage auch auf rauhe Rohraussenflächen verpresst wird. Dabei ist in keinem Teil der Dichtungsmanschette deren Material auf Zug, d.h. auf Dehnung beansprucht, so dass auch bei Erlahmen der elastischen Eigenschaften des Elastomers, beispielsweise wegen Alterung und/oder thermischer Wechselbeanspruchung eine einwandfreie Abdichtung gewährleistet bleibt.Such a pipe coupling is known for example from DE-OS 24 28 101.4. This known pipe coupling has proven itself very well in practice. The special concept of this known coupling is that when the tensioning screws are not yet tightened, the inside diameter is larger than the outside diameter of the pipe or the sealing sleeve having the pipe ends to be connected when the tensioning screws are tightened in the circumferential direction (and thus also radially inwards), whereby the material of the sleeve and in particular its sealing lips, following the only degree of freedom, deviates inwards and is also pressed onto rough pipe outer surfaces for the sealing support. No part of the sealing sleeve has its material in tension, i.e. stretched so that even when the elastic properties of the elastomer weaken, for example due to aging and / or thermal cycling, a perfect seal is guaranteed.

Die bekannte Kupplung lässt sich aber nur durch axiales Aufschieben auf das Rohr bzw. auf die zu verbindenen Rohrenden montieren. Dies setzt wiederum voraus, dass eines der Rohrenden axial zugänglich sein muss, d.h. dass dieses Rohrende in bezug auf das andere, anzukuppelnde Rohrende sich entweder axial oder aber seitlich verschieben und dann - nach Aufschieben der Kupplung - wieder in Ausgangslage zurückbringen lassen muss. Dies ist namentlich bei vielen, bestehenden Rohrleitungen nicht ohne weiteres möglich, so dass die bekannte Kupplung, z.B. beim Ausfall einer Rohrverbindung bei im übrigen noch intakten Rohren einer bestehenden Rohrleitung - wenn überhaupt - nur nach mühseligen Zusatzarbeiten eingesetzt werden kann.However, the known coupling can only be mounted by axially pushing it onto the pipe or onto the pipe ends to be connected. This in turn presupposes that one of the pipe ends must be axially accessible, i.e. that this pipe end must move either axially or laterally with respect to the other pipe end to be coupled and then - after the coupling has been pushed on - must be able to be brought back to the starting position. This is not easily possible, especially with many existing pipes, so that the known coupling, e.g. If a pipe connection fails, the pipes of an existing pipe are still intact - if at all - can only be used after laborious additional work.

Es ist daher ein Zweck der Erfindung, eine Kupplung der eingangs genannten Art zu schaffen, die bei Beibehaltung des bewährten Konzeptes (Stauchen der Dichtmanschette in Umfangsrichtung) auch von der Seite, z.B. auf den Stoss zwischen den Enden zweier fluchtender Rohre aufgesetzt werden kann.It is therefore a purpose of the invention to provide a coupling of the type mentioned which, while maintaining the proven concept (compression of the sealing collar in the circumferential direction), also from the side, e.g. can be placed on the joint between the ends of two aligned pipes.

Zu diesem Zweck weist die vorgeschlagene Kupplung die im Kennzeichen des Anspruches 1 angegebenen Merkmale auf.For this purpose, the proposed coupling has the features specified in the characterizing part of claim 1.

Das Aussergewöhnliche an der vorgeschlagenen Kupplung liegt unter anderen Dingen darin, dass die Dichtungsmanschette einen Trennschnitt in axialer Richtung aufweist. Dieser erlaubt einerseits das Aufsetzen aus radialer Richtung. Andererseits könnte nach fachmännischer Vorstellung durch diesen Trennschnitt aber das Dichtvermögen der Dichtmanschette in Frage gestellt sein, doch werden bei der vorgeschlagenen Kupplung - beim Anziehen der Spannschrauben - die an den Trennschnitt angrenzenden Schnittflächen der Dichtmanschette wegen des bereits beschriebenen Stauchens derselben im Umfangssinne, so stark aneinander gepresst, dass überraschenderweise das Dichtvermögen ebenso einwandfrei gewährleistet bleibt, als wäre die Dichtmanschette in ihrem Umfang in sich geschlossen.The unusual thing about the proposed coupling is, among other things, that the sealing sleeve has a separating cut in the axial direction. On the one hand, this allows attachment from the radial direction. On the other hand, the sealing ability of the sealing sleeve could be called into question by this separation cut, but with the proposed coupling - when tightening the tensioning screws - the cutting surfaces adjacent to the separation cut become the Sealing sleeve because of the compression of the same in the circumferential sense already described, pressed so strongly against one another that, surprisingly, the sealing ability remains just as perfect as if the sealing sleeve were closed in their extent.

Merkmale besonders bevorzugter Ausführungsformen der vorgeschlagenen Kupplung sind den abhängigen Patentansprüchen zu entnehmen.Features of particularly preferred embodiments of the proposed coupling can be found in the dependent claims.

Die Erfindung ist nachstehend rein beispielsweise anhand der Zeichnung näher beschrieben. Es zeigt:

  • Fig. 1 eine Stirnansicht einer Ausführungsform in aufgeweitetem Zustand,
  • Fig. 2 eine Stirnansicht der Kupplung gemäss Fig. 1, auf ein Rohr bzw. einen Rohrstoss aufgesetzt, mit eingesetzten, jedoch nicht angezogenen Spannschrauben,
  • Fig. 3 einen Schnitt etwa längs der Linie III-III der Fig. 2 oder 6 bei noch nicht angezogenen Spannschrauben,
  • Fig. 4 einen Schnitt ähnlich wie Fig. 3, jedoch mit angezogenen Spannschrauben,
  • Fig. 5 in perspektivischer Darstellung ein Detail des einen an den Trennschnitt angrenzenden Endbereichs der Dichtmanschette, und
  • Fig. 6 eine Stirnansicht einer weiteren Ausführungsform.
The invention is described below purely for example with reference to the drawing. It shows:
  • 1 is an end view of an embodiment in the expanded state,
  • 2 shows an end view of the coupling according to FIG. 1, placed on a pipe or a pipe joint, with inserted but not tightened clamping screws,
  • 3 shows a section approximately along the line III-III of FIG. 2 or 6 with the tensioning screws not yet tightened,
  • 4 shows a section similar to FIG. 3, but with tightening screws,
  • 5 shows a perspective illustration of a detail of one end region of the sealing collar adjoining the separating cut, and
  • Fig. 6 is an end view of another embodiment.

Vorerst wird auf die Fig. 1 - 5 Bezug genommen, die keinerlei Anspruch auf exakte Massstäblichkeit erheben.For now, reference is made to FIGS. 1-5, which make no claim to exact scale.

Die dargestellte Kupplung 10 besitzt ein Gehäuse 11, das eine Dichtungsmanschette 12 aus einem Elastomer umschliesst. Das Gehäuse 11 besteht aus einem schellenförmigen Teil 13, an dessen Enden 13', 13" nach aussen umgebogene und mit der äusseren Mantelfläche des Teiles 13 verschweisste Lappen 14,15 vorhanden sind. Der Lappen 14 umschliesst einen Scharnierzapfen 16, der mit mehreren, beispielsweise zwei, parallelachsigen und quer verlaufenden Gewindebohrungen 17 versehen ist. Der Lappen 15 umschliesst ebenfalls einen Scharnierzapfen 18, der mit glatten Querbohrungen 19 versehen ist, wobei ebensoviele Querbohrungen 19 als Gewindebohrungen 17 und in gleichen Abständen vorhanden sind. Durch nicht dargestellte Ausnehmungen im Lappen 15, durch die Querbohrungen 19 und durch nicht dargestellte Ausnehmungen im Lappen 14 erstrecken sich in die Gewindebohrungen 17 eingeschraubte Spannbolzen 20.The coupling 10 shown has a housing 11 which encloses a sealing sleeve 12 made of an elastomer. The housing 11 consists of a clamp-shaped part 13, at the ends 13 ', 13 "of which flaps 14, 15 are bent outwards and welded to the outer circumferential surface of the part 13. The flap 14 encloses a hinge pin 16 which is provided with several, for example is provided with two parallel-axis and transverse threaded bores 17. The tab 15 likewise encloses a hinge pin 18 which is provided with smooth transverse bores 19, with as many transverse bores 19 being provided as threaded bores 17 and at equal intervals. clamping bolts 20 screwed into the threaded bores 17 extend through the transverse bores 19 and through recesses in the tab 14 (not shown).

Wie insbesondere den Fig. 3 und 4 zu entnehmen ist, weist der schellenförmige Teil 13 an beiden Stirnseiten nach innen gerichtete Ringflansche 21,22 auf, so dass das schellenförmige Teil ein Axialprofil etwa in der` Form eines lanqestreckten, nach innen offenen C besitzt.As can be seen in particular from FIGS. 3 and 4, the clamp-shaped part 13 has inwardly directed ring flanges 21, 22 on both end faces, so that the clamp-shaped part has an axial profile approximately in the shape of an elongated C which is open towards the inside.

Das Gehäuse 11 besteht ferner aus einem (in montiertem Zustand) innen an den Enden 13', 13" anliegenden, mit dem schellenförmigen Teil etwa profilgleiches Ueberbrückungs- teil 23, das, wie aus der Fig. 1 ersichtlich, an der In- nenseite des Endes 13' beispielsweise durch Punktver- schweissung befestigt ist. Das Gehäuse 11, d.h. das schellenförmige Teil 13 und das Ueberbrückungsteil 23 besteht vorzugsweise aus rostfestem Stahl.The housing 11 further consists of a (mounted) on the inside of the ends 13 ', adjacent 13 ", with the clip-shaped part about profil same U eberbrückungs- part 23 which, as can be seen from Fig. 1, n at the home 'is, for example unktver- weld fixed by P exterior of the end. 13 the housing 11, that is, the clamp-shaped part 13 and the bridging part 23 are preferably made of stainless steel.

Aus Fig. 1 geht besonders deutlich hervor, dass das bei dieser Ausführungsform einstückig ausgebildete, schellenförmige Teil 13 im Prinzip drei Abschnitte aufweist, nämlich die an die Enden 13', 13" anschliessenden, verhältnismässig biegesteifen (wegen den Ringflanschen 21,22) Abschnitte 24,25,die in ihrem, den Enden 13', 13" gegenüberliegenden Bereich durch einen Mittelabschnitt 26 miteinander verbunden sind. Im Mittelabschnitt 26 sind die stirnseitigsn Ringflansche durch mehrere radial verlaufende Schlitze 27 in Segmente 28, 29 aufgetrennt, wobei das den Enden 13', 13" diametral gegenüberliegende Segment 29 in Umfangsrichtung bedeutend länger ist, als die in Umfangsrichtung dem Segment 29 benachbarten Segmente 28. Daraus ergibt sich, dass der Abschnitt 26 um zur Achse der Kupplung parallele Biegeachsen biegsam ist und gewissermassen die Funktion eines Scharniers ausübt, so dass sich das schellenförmige Teil ohne weiteres so weit aufweiten lässt, dass das schellenförmige Teil 13 sich aus radialer Richtung über ein Rohr 30 bzw. über den Stoss zwischen den Enden zweier fluchtender Rohre aufsetzen lässt.It is particularly clear from FIG. 1 that the clamp-shaped part 13, which is formed in one piece in this embodiment, in principle has three sections, namely the sections 24 which are relatively rigid (due to the ring flanges 21, 22) and which adjoin the ends 13 ', 13 " , 25, which are connected to one another in their area opposite ends 13 ', 13 "by a central section 26. In the central section 26, the end-face annular flanges are separated into segments 28, 29 by a plurality of radially extending slots 27, the segment 29 diametrically opposite the ends 13 ', 13 "being significantly longer in the circumferential direction than the segments 28 adjacent to the segment 29 in the circumferential direction. It follows from this that section 26 is flexible about bending axes parallel to the axis of the coupling and to a certain extent performs the function of a hinge, so that the clamp-shaped part can easily be expanded so far that the clamp-shaped part 13 extends from the radial direction via a tube 30 or over the joint between the ends of two aligned pipes.

Damit dies auch für die Dichtmanschette 12 möglich ist, weist diese einen axialen Trennschnitt 31 (Fig. 2) auf, der, in montiertem Zustand, in Umfangsrichtung bezüglich des Ueberbrückungsteiles 23 versetzt ist. In der Tat steht, wie deutlich aus Fig. 1 ersichtlich ist, die eine an den Trennschnitt 31 angrenzende Schnittfläche 32 der Manschette 12 über das freie, vom Ende 13' abstehende Ende des Ueberbrückungsteiles 23 hervor. Die andere, an den Trennschnitt 31 angrenzende Schnittfläche 33 der Dichtmanschette 12 ist dementsprechend in Umfangsrichtung gegenüber dem Ende 13" zurückversetzt angeordnet und dort an der Innenseite des Gehäuses 11, z.B. durch Verklebung befestigt ist.So that this is also possible for the sealing sleeve 12, it has an axial separating cut 31 (FIG. 2) which, in the assembled state, is offset in the circumferential direction with respect to the bridging part 23. In fact, as can be clearly seen from FIG. 1, the one cut surface 32 of the sleeve 12 adjoining the separating cut 31 projects beyond the free end of the bridging part 23 projecting from the end 13 '. The other cutting surface 33 of the sealing collar 12 adjoining the separating cut 31 is correspondingly arranged set back in the circumferential direction with respect to the end 13 ″ and fastened there on the inside of the housing 11, for example by gluing.

Um zu gewährleisten, dass beim Schliessen der Kupplung, d.h. beim Ueberführen derselben aus dem in Fig. 1 dargestellten, aufgeweiteten Zustand in den in Fig. 2 dargestellten Zustand die beiden Schnittflächen 32 und 33 möglichst deckungsgleich aufeinander zu liegen kommen, ist, wie aus Fig. 5 deutlich hervorgeht, an der Innenseite der Dichtmanschette 12 zwischen deren Dichtlippen 34 und 35 ein Führungslappen 36, vorzugsweise aus dem gleichen Material wie die Dichtmanschette 12 selbst angeklebt.To ensure that when the clutch is closed, i.e. When transferring the same from the expanded state shown in FIG. 1 to the state shown in FIG. 2, the two cut surfaces 32 and 33 come to lie as congruently as possible, as clearly shown in FIG. 5, on the inside of the sealing sleeve 12 between the sealing lips 34 and 35 a guide tab 36, preferably glued from the same material as the sealing sleeve 12 itself.

Das axiale Querschnittsprofil der Dichtmanschette ist deutlich aus Fig. 3 und 4 (betriebsbereite Kupplung) zu ersehen. Die Manschette 12 besitzt einen Steg 37, an dessen Stirnseiten die bereits erwähnten, gegeneinander gerichteten Dichtlippen 34, 35 geformt sind. Auf der Höhe beider Dichtlippen 34, 35 ist am Steg 37 je ein ringförmiger, nach innen weisender Wulst 38, 39 angeformt, auf den sich die Dichtlippen 35, 34 aussen abstützen. Die Wülste 38, 39 sind auch mit im wesentlichen axial verlaufenden Durchlässen 40, 41 versehen. Anstelle der angeformten Wülste 38, 39 können auch aufgetrennte Schraubenfederringe vorgesehen sein (nicht dargestellt), um die Dichtlippen 35, 34 gegen den Steg 37 abzustützen.The axial cross-sectional profile of the sealing sleeve can be seen clearly from FIGS. 3 and 4 (coupling ready for operation). The cuff 12 has a web 37, on the end faces of which the sealing lips 34, 35, which are directed towards one another, are formed. At the level of both sealing lips 34, 35, an annular, inwardly pointing bead 38, 39 is formed on the web 37, on which the sealing lips 35, 34 are supported on the outside. The beads 38, 39 are also provided with substantially axially extending passages 40, 41. Instead of the integrally formed beads 38, 39, split spring washers can also be provided (not shown) in order to support the sealing lips 35, 34 against the web 37.

Wenn nun die in Fig. 1 in aufgeweitetem Zustand dargestellte Kupplung um das Rohr 30, bzw. um den Stoss zwischen zwei fluchtenden Rohren gelegt und der biegsame Abschnitt zurückgebogen wird, kommen die Schnittflächen 32, 33 der Manschette, geführt durch den Führungslappen 36, praktisch deckungsgleich aufeinander zu liegen. Nach Einsetzen der Scharnierzapfen 16, 18 werden die Spannbolzen 20 eingeschraubt. Die Kupplung hat nun die in Fig. 2 dargestellte Gestalt. Zieht man nun die Spannbolzen 20 an, so verringert sich der-Gesamtumfang und.damit auch der Durchmesser des Gehäuses 11. Die Dichtungsmanschette 12 wird dabei im Umfangssinne gestaucht und, da sie nur nach innen ausweichen kann, wird sie, wie in Fig. 4 dargestellt, mit ihren Dichtlippen 34, 35 satt und dichtend an den Umfang des Rohres 30 gepresst.If the coupling shown in FIG. 1 in the expanded state is placed around the pipe 30 or the joint between two aligned pipes and the flexible section is bent back, the cut surfaces 32, 33 of the sleeve, guided by the guide tab 36, come in handy to be congruent to each other. After inserting the hinge pins 16, 18, the clamping bolts 20 are screwed in. The clutch now has that shown in FIG. 2 Shape. If one now draws the clamping bolt 20, so the reduced - total volume und.damit the diameter of the housing 11. The gasket cuff 12 is thereby compressed in the circumferential sense, and because it can only escape to the inside, it is, as shown in Fig. 4 shown, pressed with their sealing lips 34, 35 full and sealing against the circumference of the tube 30.

Aus dem Gesagten ergibt sich, dass die beschriebene Kupplung auch bestens dazu geeignet ist, ein in einem Rohr vorhandenes Leck, z.B. einen Riss 42, einwandfrei abzudichten.From what has been said, it follows that the coupling described is also ideally suited to detecting a leak in a pipe, e.g. a crack 42 to seal properly.

Wenn der zwischen Aussenfläche des Rohres 30 bzw. der Rohrenden und der Innenseite des Steges vorhandene Zwischenraum (bei festgespannter Kupplung gemäss Fig. 4) vom Druck des vom Rohr geführten Mediums beaufschlagt wird, so werden dadurch die Dichtlippen 34, 35 und die Schnittflächen 32, 33 zusätzlich an die Rohroberfläche bzw. aneinander angepresst. Dies deswegen, weil sich dieser Druck durch die Durchlässe 40, 41 in den Zwischenraum zwischen dem Wulst 38 bzw. 39 und der Wurzel der zugeordneten Dichtlippe 35 bzw. 34 fortpflanzt.If the space between the outer surface of the pipe 30 or the pipe ends and the inside of the web (in the case of a tight coupling according to FIG. 4) is acted upon by the pressure of the medium guided by the pipe, the sealing lips 34, 35 and the cut surfaces 32, 33 additionally pressed against the pipe surface or against each other. This is because this pressure propagates through the passages 40, 41 into the space between the bead 38 or 39 and the root of the associated sealing lip 35 or 34.

Die Ausführungsform der Fig. 6, die besonders für grosse Rohrdurchmesser geeignet ist, unterscheidet sich von der bisher beschriebenen Ausführungsform lediglich dadurch, dass die biegesteifen Abschnitte 24, 25 des schellenartigen Teiles 13 des Gehäuses 11 nicht durch einen biegsamen, angeformten Mittelabschnitt, sondern durch ein Doppelscharnier 43 miteinander verbunden sind. An den den Enden 13', 13" gegenüberliegenden Enden der Abschnitte 24, 25 sind nach aussen aufgebogene Lappen 44, 45 vorhanden, die je einen Scharnierzapfen 46, 47 umschliessen. Die Scharnierzapfen 46, 47 sind mittels Schraubbolzen 48 aneinandergekuppelt, ähnlich wie dies für die Scharnierzapfen 16, 18 beschrieben wurde.The embodiment of FIG. 6, which is particularly suitable for large pipe diameters, differs from the previously described embodiment only in that the rigid sections 24, 25 of the clamp-like part 13 of the housing 11 do not have a flexible, integrally formed central section, but rather a Double hinge 43 are interconnected. At the ends of the sections 24, 25 opposite the ends 13 ', 13 "there are flaps 44, 45 which are bent outwards and each enclose a hinge pin 46, 47. The hinge pins 46, 47 are connected to one another by means of screw bolts 48 couples, similar to what has been described for the hinge pins 16, 18.

Der Spalt zwischen den an das Doppelscharnier 43 angrenzenden Enden der Abschnitte 24, 25 ist durch ein an der Innenseite dieser beiden Enden anliegendes Ueberbrückungsteil 49, das mit dem Ueberbrückungsteil 23 vergleichbar ist, überbrückt. Die Scharnierzapfen 46, 47 können auch näher zueinander als in Fig. 6 dargestellt angeordnet sein.The gap between the ends of the sections 24, 25 adjoining the double hinge 43 is bridged by a bridging part 49, which is located on the inside of these two ends and which is comparable to the bridging part 23. The hinge pins 46, 47 can also be arranged closer to one another than shown in FIG. 6.

Im Betrieb ist die Wirkungsweise der Ausführungsform der Fig. 6 dieselbe wie jene der Ausführungsform der Fig. 1. Bei der-Montage der Ausführungsform der Fig. 6 wird indessen kein Teil des Gehäuses deformiert.In operation, the operation of the embodiment of F ig. 6 the same as that of the embodiment of FIG. 1. However, when the embodiment of FIG. 6 is assembled, no part of the housing is deformed.

Selbstverständlich können die beschriebenen Kupplungen, die zunächst je im Zustand der Fig. 1 oder 6 vorliegen, auch axial auf ein Rohrende aufgeschoben werden und insofern ist die beschriebene Kupplung sozusagen universell, insbesondere auch als "Reparaturschelle" verwendbar.Of course, the described couplings, which are initially each in the state of FIG. 1 or 6, can also be pushed axially onto a pipe end, and in this respect the coupling described can be used universally, in particular, as a "repair clamp".

Claims (10)

l. Rohrkupplung mit einem in seinem Umfang verkleinerbaren Gehäuse (11), bestehend aus einem schellenförmigen Teil (13), dessen Enden (13',13") mit Spannschrauben (20) lösbar miteinander verbunden sind und das stirnseitig mit nach innen gerichteten Ringflanschen (21,22) versehen ist, sowie aus einer von innen an den Enden (13', 13") des schellenförmigen Teiles (13) anliegenden, mit diesem profilgleichen Ueberbrückungseinlage (23), welches Gehäuse (11) eine im axialen Querschnitt C-förmige, nach innen offene Dichtmanschette (12) aus einem Elastomer umschliesst, deren als Dichtlippen (34,35) ausgebildete Enden über eine ringförmige Abstützung (38,39) am Manschettensteg (37) abgestützt sind, wobei bei ungespannten Spannschrauben (2.0) der Innendurchmesser der Dichtmanschette (12) grösser ist als der auf das Rohr (30) bezogene Nenndurchmesser der Kupplung, dadurch gekennzeichnet, dass die Dichtmanschette (12) einen in axialer Richtung verlaufenden Trennschnitt (31) aufweist, und dass der schellenartige Teil (13) zwei je an ein Ende (13',13") anschliessende Abschnitte (24,25) aufweist, die in dem den Enden (13',13") gegenüberliegenden Bereich scharnierartig miteinander verbunden sind, um das Gehäuse, nach Lösen der Spannschrauben, durch Auseinanderbewegen der Enden bis über den Nenndurchmesser aufzuweiten.l. Pipe coupling with a housing (11) that can be reduced in size, consisting of a clamp-shaped part (13), the ends (13 ', 13 ") of which are releasably connected to one another by means of tensioning screws (20), and which has ring flanges (21, 22) is provided, as well as a bridging insert (23) with the same profile from the inside at the ends (13 ', 13 ") of the clamp-shaped part (13), which housing (11) has a C-shaped axial cross section, according to sealing sleeve (12) made of an elastomer, the ends of which are formed as sealing lips (34, 35) are supported on the sleeve web (37) via an annular support (38, 39), the inner diameter of the sealing sleeve (without tensioning screws (2.0)) 12) is greater than the nominal diameter of the coupling related to the pipe (30), characterized in that the sealing sleeve (12) has a separating cut (31) running in the axial direction, and that the claw Allen-like part (13) has two sections (24, 25) each adjoining one end (13 ', 13 "), which are connected to one another in a hinge-like manner in the region opposite the ends (13', 13") to expand the housing after loosening the clamping screws by moving the ends apart to above the nominal diameter. 2. Rohrkupplung nach Patentanspruch 1, dadurch gekennzeichnet, dass die an die Enden (13',13") des schellenförmigen Teils (13) anschliessenden Abschnitte (24,25) biegesteif sind und in dem den Enden (13',13") diametral gegenüberliegenden Bereich durch einen angeformten, um achsparallele Biegeachsen biegsamen Mittelabschnitt (26) miteinander verbunden sind.2. Pipe coupling according to claim 1, characterized in that the ends (13 ', 13 ") of the clamp-shaped part (13) adjoining sections (24, 25) are rigid and in which the ends (13', 13") are diametrical opposite area are connected to one another by a molded-on central section (26) which is flexible about axis-parallel bending axes. 3. Rohrkupplung nach Patentanspruch 1, dadurch gekennzeichnet, dass die an die Enden (13',13") des schellenförmigen Teiles (13) anschliessenden Abschnitte (24,25) biegesteif sind und in dem den Enden (13',13") gegenüberliegenden Bereich durch ein Scharnier (43) miteinander verbunden sind, wobei im Bereich des Scharnieres (43) eine weitere, profilgleiche Ueberbrückungseinlage (49) angeordnet ist.3. Pipe coupling according to claim 1, characterized in that the ends (13 ', 13 ") of the clamp-shaped part (13) adjoining sections (24, 25) are rigid and in which the ends (13', 13") are opposite Area are connected to one another by a hinge (43), a further bridging insert (49) of the same profile being arranged in the area of the hinge (43). 4. Rohrkupplung nach Patentanspruch 2, dadurch gekennzeichnet, dass der biegsame Mittelabschnitt (26) ein zu den biegesteifen Abschnitten (24,25) identisches Längsprofil aufweist, wobei die am biegsamen Mittelabschnitt (26) vorhandenen, nach innen gerichteten Abschnitte der Ringflansche (21,22) durch radial verlaufende Schlitze (27) in Segmente (28,29) aufgeteilt sind.4. Pipe coupling according to claim 2, characterized in that the flexible central section (26) has an identical longitudinal profile to the rigid sections (24, 25), the inward-facing sections of the annular flanges (21, 21) on the flexible central section (26). 22) are divided into segments (28, 29) by radially extending slots (27). 5. Rohrkupplung nach Patentanspruch 4, dadurch gekennzeichnet, dass die Segmente der Ringflanschabschnitte des biegsamen Mittelabschnittes (26) ein den Enden (13',13") diametral gegenüberliegendes Segment (29) aufweisen, das in Umfangsrichtung länger ist als die in Umfangsrichtung anschliessenden Segmente (28).5. Pipe coupling according to claim 4, characterized in that the segments of the ring flange sections of the flexible central section (26) one of the ends (13 ', 13 ") have diametrically opposite segment (29) which is longer in the circumferential direction than the segments (28) adjoining in the circumferential direction. 6. Rohrkupplung nach Patentanspruch 1, dadurch gekennzeichnet, dass der Trennschnitt (31) der Dichtmanschette (12) bei geschlossenem Gehäuse (11) in Umfangsrichtung bezüglich der an dem einen Ende (13') des schellenförmigen Teiles (13) befestigten Ueberbrückungseinlage (23) versetzt angeordnet ist.6. Pipe coupling according to claim 1, characterized in that the separating cut (31) of the sealing sleeve (12) when the housing (11) is closed in the circumferential direction with respect to the bridging insert (23) attached to one end (13 ') of the clamp-shaped part (13). is staggered. 7. Rohrkupplung nach Patentanspruch 6, dadurch gekennzeichnet, dass bei aufgeweitetem Gehäuse (11) die eine an den Trennschnitt (31)angrenzende Schnittfläche (32) der Dichtmanschette (12) in Umfangsrichtung über das freie Ende der Ueberbrückungseinlage (23) vorsteht.7. Pipe coupling according to claim 6, characterized in that when the housing (11) is extended, the one on the separating cut (31) adjacent cutting surface (32) of the sealing sleeve (12) projects in the circumferential direction over the free end of the bridging insert (23). 8. Rohrkupplung nach Patentanspruch 1, dadurch gekennzeichnet, dass der Trennschnitt (31) an der Innenseite des Steges (37) und zwischen den Dichtlippen (34,35) durch einen Führungslappen (36) aus einem Elastomer überbrückt ist, welcher an dem einen, an den Trennschnitt (31) angrenzenden Endbereich der Dichtmanschette (12) befestigt ist.8. Pipe coupling according to claim 1, characterized in that the separating cut (31) on the inside of the web (37) and between the sealing lips (34, 35) is bridged by a guide tab (36) made of an elastomer, which on the one, is attached to the separating cut (31) adjacent end region of the sealing sleeve (12). 9. Rohrkupplung nach Patentanspruch 7, dadurch gekennzeichnet, dass die Dichtmanschette (12) im Bereich der anderen, an den Trennschnitt angrenzenden Schnittfläche (33) an der Innenseite des Gehäuses (11) befestigt ist, z.B. durch Verklebung.9. Pipe coupling according to claim 7, characterized in that the sealing sleeve (12) in the area of the other, adjacent to the separating cut surface (33) is attached to the inside of the housing (11), e.g. by gluing. 10. Verwendung der Rohrkupplung nach einem der vorangehenden Patentansprüche zum Abdichten eines Leckes (42) in einem Rohr (30).10. Use of the pipe coupling according to one of the preceding claims for sealing a leak (42) in a pipe (30).
EP82109218A 1981-11-05 1982-10-06 Pipe coupling and its utilization Withdrawn EP0079457A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH7076/81 1981-11-05
CH7076/81A CH653113A5 (en) 1981-11-05 1981-11-05 PIPE COUPLING AND USE THEREOF.

Publications (1)

Publication Number Publication Date
EP0079457A1 true EP0079457A1 (en) 1983-05-25

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP82109218A Withdrawn EP0079457A1 (en) 1981-11-05 1982-10-06 Pipe coupling and its utilization

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EP (1) EP0079457A1 (en)
JP (1) JPS5884289A (en)
CH (1) CH653113A5 (en)
DE (1) DE8228939U1 (en)
ES (1) ES278726U (en)
ZA (1) ZA827899B (en)

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EP0214395A1 (en) * 1985-09-12 1987-03-18 Taylor Kerr (Couplings) Limited Elastic pipe joint, especially a flexible pipe coupling
EP0241584A1 (en) * 1986-04-11 1987-10-21 M &amp; FC HOLDING COMPANY, INC. Improved 360 degree pipe repair clamp
DE8709508U1 (en) * 1987-07-10 1987-10-22 Kammann-Metallbau, 2833 Harpstedt, De
US4715626A (en) * 1984-09-27 1987-12-29 Mage Ag Clamping sleeve with a clamping screw
US4795199A (en) * 1984-12-15 1989-01-03 Nage Ag Clamping sleeve for pipes
US5056833A (en) * 1987-03-25 1991-10-15 Taylor Kerr (Couplings) Limited Flexible pipe coupling
FR2673872A1 (en) * 1991-03-15 1992-09-18 Griffon Joel Improved weld-seam masking device for pipework of various types
EP0550813A1 (en) * 1992-01-07 1993-07-14 Straub Federnfabrik Ag Pipe coupling
FR2782367A1 (en) * 1998-08-12 2000-02-18 3X Engineering Pipe leak stopper comprises elastomer plate with plastic force applicator slitted to follow pipe surface
US6270124B1 (en) * 1999-03-29 2001-08-07 Shimano Inc. Band adapter for front derailleur
US6457748B1 (en) 1996-05-31 2002-10-01 Taylor Kerr (Couplings) Ltd. Fire-resistant pipe coupling
DE102004037740A1 (en) * 2004-08-04 2006-03-16 Sram Deutschland Gmbh Flexible clamp insert
DE102007008326A1 (en) * 2007-02-16 2008-08-21 Sram Deutschland Gmbh Kettenumwerferbefestigung
US7726703B2 (en) * 2006-06-07 2010-06-01 Victaulic Company Deformable pipe coupling having multiple radii of curvature
US8282136B2 (en) 2008-06-30 2012-10-09 Mueller International, Llc Slip on groove coupling with multiple sealing gasket
USD680629S1 (en) 2011-11-21 2013-04-23 Mueller International, Llc Slip-on coupling segment
USD680630S1 (en) 2011-11-21 2013-04-23 Mueller International, Llc Slip-on coupling assembly
US8448993B2 (en) 2009-06-12 2013-05-28 Romac Industries, Inc. Pipe coupling
USD696751S1 (en) 2011-10-27 2013-12-31 Mueller International, Llc Slip-on gasket
US8646165B2 (en) 2004-05-14 2014-02-11 Victaulic Company Method of securing pipe elements end to end
US8894100B2 (en) 2012-03-16 2014-11-25 Romac Industries, Inc. Fitting with draw mechanism
US9039046B2 (en) 2012-01-20 2015-05-26 Mueller International, Llc Coupling with tongue and groove
US9168585B2 (en) 2012-11-02 2015-10-27 Mueller International, Llc Coupling with extending parting line
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US9534715B2 (en) 2012-01-20 2017-01-03 Mueller International, Llc Coupling gasket with multiple sealing surfaces
CN110822212A (en) * 2019-12-20 2020-02-21 大连福佳·大化石油化工有限公司 Air cooling tube bundle leak stopper and leak stopping method thereof
CN110848505A (en) * 2019-12-20 2020-02-28 北京吉瑞普管道技术有限公司 Fire-encountering expansion device
US11274777B2 (en) 2009-06-12 2022-03-15 Romac Industries, Inc. Pipe coupling
US11454342B2 (en) * 2018-03-23 2022-09-27 Uniones Arpol, S.A. Flange seal for pipe and repair of pipes

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JP2528348Y2 (en) * 1991-12-12 1997-03-12 ショーボンド建設株式会社 Repair fittings
JPH0645199U (en) * 1992-11-30 1994-06-14 積水化学工業株式会社 Pipe repair cover
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Publication number Priority date Publication date Assignee Title
US4715626A (en) * 1984-09-27 1987-12-29 Mage Ag Clamping sleeve with a clamping screw
US4795199A (en) * 1984-12-15 1989-01-03 Nage Ag Clamping sleeve for pipes
EP0186728B1 (en) * 1984-12-15 1989-03-01 Mage Ag Tensile socket for pipes
EP0214395A1 (en) * 1985-09-12 1987-03-18 Taylor Kerr (Couplings) Limited Elastic pipe joint, especially a flexible pipe coupling
GB2180311B (en) * 1985-09-12 1989-08-23 Taylor Kerr Flexible pipe coupling
EP0241584A1 (en) * 1986-04-11 1987-10-21 M &amp; FC HOLDING COMPANY, INC. Improved 360 degree pipe repair clamp
US5056833A (en) * 1987-03-25 1991-10-15 Taylor Kerr (Couplings) Limited Flexible pipe coupling
DE8709508U1 (en) * 1987-07-10 1987-10-22 Kammann-Metallbau, 2833 Harpstedt, De
FR2673872A1 (en) * 1991-03-15 1992-09-18 Griffon Joel Improved weld-seam masking device for pipework of various types
EP0550813A1 (en) * 1992-01-07 1993-07-14 Straub Federnfabrik Ag Pipe coupling
US5280970A (en) * 1992-01-07 1994-01-25 Straub Federnfabrik Ag Pipe coupling
US6457748B1 (en) 1996-05-31 2002-10-01 Taylor Kerr (Couplings) Ltd. Fire-resistant pipe coupling
FR2782367A1 (en) * 1998-08-12 2000-02-18 3X Engineering Pipe leak stopper comprises elastomer plate with plastic force applicator slitted to follow pipe surface
WO2000009936A1 (en) * 1998-08-12 2000-02-24 3X Engineering Device for stopping a leak in a pipe
US6334465B2 (en) 1998-08-12 2002-01-01 3X Engineering Device for stopping a leak in a pipe
US6270124B1 (en) * 1999-03-29 2001-08-07 Shimano Inc. Band adapter for front derailleur
US8646165B2 (en) 2004-05-14 2014-02-11 Victaulic Company Method of securing pipe elements end to end
DE102004037740A1 (en) * 2004-08-04 2006-03-16 Sram Deutschland Gmbh Flexible clamp insert
US7789351B2 (en) 2004-08-04 2010-09-07 Sram Deutschland Gmbh Clamping insert
US8819914B2 (en) 2006-06-07 2014-09-02 Victaulic Company Method of securing pipe elements in end to end relation
US7726703B2 (en) * 2006-06-07 2010-06-01 Victaulic Company Deformable pipe coupling having multiple radii of curvature
DE102007008326A1 (en) * 2007-02-16 2008-08-21 Sram Deutschland Gmbh Kettenumwerferbefestigung
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US11739869B2 (en) 2012-01-20 2023-08-29 ASC Engineered Solutions, LLC Coupling gasket with multiple sealing surfaces
US9631746B2 (en) 2012-01-20 2017-04-25 Anvil International, Llc Coupling with tongue and groove
US11365835B2 (en) 2012-01-20 2022-06-21 ASC Engineered Solutions, LLC Coupling gasket with multiple sealing surfaces
US9297484B2 (en) 2012-01-20 2016-03-29 Mueller International, Llc Slip-on coupling
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US8894100B2 (en) 2012-03-16 2014-11-25 Romac Industries, Inc. Fitting with draw mechanism
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US11454342B2 (en) * 2018-03-23 2022-09-27 Uniones Arpol, S.A. Flange seal for pipe and repair of pipes
CN110822212A (en) * 2019-12-20 2020-02-21 大连福佳·大化石油化工有限公司 Air cooling tube bundle leak stopper and leak stopping method thereof
CN110848505A (en) * 2019-12-20 2020-02-28 北京吉瑞普管道技术有限公司 Fire-encountering expansion device
CN110822212B (en) * 2019-12-20 2024-01-23 大连福佳·大化石油化工有限公司 Air cooling tube bundle plugging device and plugging method thereof

Also Published As

Publication number Publication date
CH653113A5 (en) 1985-12-13
JPS5884289A (en) 1983-05-20
DE8228939U1 (en) 1985-05-15
ZA827899B (en) 1983-08-31
JPH0154600B2 (en) 1989-11-20
ES278726U (en) 1985-03-01

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